4x4 Clear Switch Tester Housing

It's decent - only for MX housings

The tester I got had protrusions on the inside, to support MX-style switch housings. However, this made it incompatible with Kailh housings like the Hako/Halo True. It was also very tight. Gazzew Boba switches fit well, but some switches I put in initially had some interference that made it very difficult to insert the switch, and once it was in it would sometimes cause the stems to no longer come back up. This issue has gone away since then, so it's possible the switch tester was still cold from delivery and has expanded a little in the mean time. Either way, the tolerances are very tight and not all switches are supported unfortunately.

Good quality switch tester

I just needed something to throw a bunch of different switches into to test and compare how each one felt. If this sounds like you, I'd recommend this switch tester as it allowed me to do just that. I also bought all the test switches here and they arrived quickly and without issue. Now I have a nice little fidget toy on my desk.